Bathtub lift



FIG. 1 is a front perspective view of a bathtub lift in accordance with the design;

FIG. 2 is a front perspective view thereof taken from a different angle of the one in FIG. 1;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a side elevational view thereof, taken opposite the one in FIG. 3;

FIG. 5 is a front elevational view thereof;

FIG. 6 is rear elevational view thereof; and,

FIG. 7 is a top plan view thereof.

The broken lines are shown for the purpose of illustrating parts of the article that form no part of the claim. 

CLAIM The ornamental design for a bathtub lift, as shown and described. 